GPX4 and glioblastoma: The regulation of GPX4 on various types of tumor cells is primarily determined by its regulation of ferroptosis; however, the treatment effect of a single GPX4 inhibitor on some types, such as glioblastoma, is poor, which indicates that the GPX4 protein is not the only target in some types of tumors, and that multiple molecular channels are involved in the growth and proliferation of these tumors.